You're supposed to get 7 hours of sleep and one hour of exercise per day. If you don't exercise then you're supposed to get 8 hours of sleep. In the military they say you can survive on 4 hours a night, if necessary, for up to a week. After that you're just not sharp enough to be useful.

I have sleep disorders. I slept about 6 hours this weekend but got 10 hours Tuesday. I've been up since around noon yesterday. Its 7:30 am now.
3 days is the longest I've gone without sleeping. I start forgetting words at that point. Sometimes I get silly when I haven't slept.

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